uboot-imx

hush.c: Move default CONFIG_SYS_PROMPT_HUSH_PS2 to hush.c

Exactly one board has defined CONFIG_SYS_PROMPT_HUSH_PS2 to a value
different than "> " which is vision2.  I have Cc'd the maintainer here
as I strongly suspect this is a bug rather than intentional behavior.

Cc: Stefano Babic <sbabic@denx.de>
Signed-off-by: Tom Rini <trini@ti.com>
Acked-by: Stefano Babic <sbabic@denx.de>